[PluginName]Preferences.xib

Either blank or with a 340x320 NSView

[PluginName]Preferences.h

@interface [PluginName]Preferences : NSViewController {

}

[PluginName].h

#import "MPPluginInterface.h"
@class [PluginName]Preferences;
@interface [PluginName] : NSObject<MPPluginProtocol> {
	[PluginName]Preferences *preferences;
}
@property (retain) [PluginName]Preferences *preferences;

[PluginName].m

#import "[PluginName].h"
#import "[PluginName]Preferences.h"
static NSBundle* pluginBundle = nil;
@implementation [PluginName]
@synthesize preferences;

+ (BOOL)initializeClass:(NSBundle*)theBundle {
	if (pluginBundle) {
		return NO;
	}
	pluginBundle = [theBundle retain];
	return YES;
}

+ (void)terminateClass {
	if (pluginBundle) {
		[pluginBundle release];
		pluginBundle = nil;
	}
}

- (id)init{
    self = [super init];
    if(self != nil) {		
		preferences = [[[PluginName]Preferences alloc] initWithNibName:@"[PluginName]Preferences" bundle:pluginBundle];	
		NSString *bundleId = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleIdentifier"];					
		if ([bundleId isEqualToString:@"com.apple.systempreferences"]) return self;	
				
		//your initialization here			
    }
    return self;
}